CN201026679Y

CN201026679Y - Protecting equipment for deflection load of benders

Info

Publication number: CN201026679Y
Application number: CNU2007200363937U
Authority: CN
Inventors: 骆桂林; 嵇宽斌; 乔礼惠; 朱道泉; 王春香
Original assignee: Jiangsu Guoli Forging Machine Tool Co Ltd
Current assignee: Jiangsu Guoli Forging Machine Tool Co Ltd
Priority date: 2007-04-05
Filing date: 2007-04-05
Publication date: 2008-02-27
Anticipated expiration: 2017-04-05

Abstract

The utility model discloses a deviation load protective device for the bending machine in the field of bending machines, comprising a sliding block rapid descending circuit, a sliding block slow descending circuit, a sliding block return circuit and a control circuit controlling the rapid descending, the slow descending and return of the sliding block and the pressure keeping and leakage of the oil cylinder. A photoelectric switch and a relay are connected in the two ends of the power supply in series, and the two normal closed contacts of the relay are connected with the block rapid descending circuit and the sliding block slow descending circuit respectively in series and then cross over the two ends of the power supply; a receiver and an emitter controlling the closing and opening of the photoelectric switch are arranged respectively in the two piston rods of the cylinder in the two ends of the sliding block. When the bending machine is deviation-loaded, the receiver cannot receive the photoelectric signal, then the photoelectric switch is closed, and the relay is power-off, and the normal closed contacts are broken, and the block rapid descending circuit and the sliding block slow descending circuit are both power-off, then the return motion of the sliding block cannot descend continuously, avoiding the break of the balance arm because of deviation load and increasing the reliability of the bending machine.

Description

Bender unbalanced load protection device

Technical field

The utility model relates to a kind of bender, particularly the safety guard of bender.

Background technology

At present, the slide block of bender substantially all is to be made by the monoblock steel plate, again with oil cylinder in piston rod link together, and cylinder body is fixed on the oil cylinder connecting plate of frame left side plate top, the piston rod that just can drive oil cylinder by the sequential control to hydraulic system drives slide block and moves up and down.Common bender slide block is in movement travel, and it is synchronous that its left and right sides two-piston moves, and adopts the counter-jib device to force synchronously and realizes.Its control circuit part, comprise the quick downstream circuitry of the slide block that is connected on respectively between the both ends of power, slide block downstream circuitry, slide block backhaul circuit and control circuit at a slow speed, control circuit is used to control that slide block is descending fast, descending, backhaul and oil cylinder pressurize at a slow speed, pressure release, when hydraulic oil enters oil cylinder, because the position deviation that two cylinder bodies install and fix and the foozle of oil cylinder all can cause the accumulation difference of two cylinder volumes, so the piston rod location deviation of two oil cylinders is inevitable.But in the slide block down process, system pressure is very little, and this moment, the position deviation of two-piston bar was easy to realize synchronously by the counter-jib device.Plate to be processed is placed on middle bending or both sides symmetry bending, normally in the slide block down process, also the fault that unbalance loading twists off arm can take place.But when plate was placed in an end bending of slide block, slide block operation downwards made the one termination contact plate, and because of plate bending distortion need reach certain pressure, the piston that is placed with this end oil cylinder of plate so just can be not descending again.And the other end can be pressed because of there not being plate, descends die orifice that certain degree of depth is arranged again simultaneously, and when pressure at two ends did not reach balance, the piston in the oil cylinder can continue descending, just can cause counter-jib to twist off when deviation acquires a certain degree.

The utility model content

The purpose of this utility model provides a kind of bender unbalanced load protection device, makes it protect bender when unbalance loading, avoids counter-jib to twist off.

The purpose of this utility model is achieved in that bender unbalanced load protection device, comprise the quick downstream circuitry of slide block, slide block downstream circuitry, slide block backhaul circuit and control circuit at a slow speed, slide block backhaul circuit and control circuit are connected between the both ends of power respectively, control circuit is used to control that slide block is descending fast, descending, backhaul and oil cylinder pressurize at a slow speed, pressure release, one optoelectronic switch and a relay are connected in series in both ends of power, and two normally-closed contacts of described relay are connected across both ends of power after the downstream circuitry series connection at a slow speed with the quick downstream circuitry of slide block, slide block respectively; Receiver that the control optoelectronic switch turns on and off and transmitter are corresponding respectively to be arranged on the two oil cylinder piston bars at slide block two ends.

During operate as normal, because two oil cylinder piston bar synchronized movement, receiver can receive the photosignal that transmitter sends all the time, optoelectronic switch is in opening, the normally-closed contact of relay remains closed, bender can operate as normal, its circuit working principle and process and prior art are identical, still, and when the bender unbalance loading, receiver does not receive photosignal, at this moment, the optoelectronic switch closure, relay gets, its normally-closed contact disconnects, quick downstream circuitry of slide block and slide block downstream circuitry at a slow speed all cut off the power supply, and have only slide block backhaul circuit to still have power supply, therefore, but slide block backhaul action but can not continue descendingly in this case, can avoid the counter-jib unbalance loading to fracture.The utility model can increase the reliability of bender, has reduced the possibility that mechanical breakdown takes place.

Description of drawings

Fig. 1 is the utility model circuit working schematic diagram;

Fig. 2 bender structural representation;

The specific embodiment

As Fig. 1, be the electrical schematic diagram of bender unbalanced load protection device, comprise the quick downstream circuitry of slide block, slide block downstream circuitry, slide block backhaul circuit and control circuit at a slow speed, slide block backhaul circuit and control circuit are connected on respectively between the power supply E two ends; Control circuit is used to control that slide block is descending fast, descending, backhaul and oil cylinder pressurize at a slow speed, pressure release, an one optoelectronic switch LK and a relay 1KA are connected in series in power supply E two ends, and two normally-closed contact 1KA1, the 1KA2 of described relay 1KA is connected across power supply E two ends after the downstream circuitry series connection at a slow speed with the quick downstream circuitry of slide block, slide block respectively; Among Fig. 2, receiver 1 that control optoelectronic switch LK turns on and off and transmitter 3 are corresponding respectively to be arranged on the two oil cylinder piston bars 4 at slide block 2 two ends.

During operate as normal, because piston rod 4 synchronized movement of two oil cylinders, receiver 1 can receive the photosignal that transmitter 3 sends all the time, optoelectronic switch LK is in opening, the normally-closed contact of relay 1KA remains closed, bender can operate as normal, and its operation principle and process and prior art are identical, still, when the bender unbalance loading, receiver 1 does not receive photosignal, at this moment, and optoelectronic switch LK closure, relay 1KA gets, its normally-closed contact 1KA1,1KA2 disconnects, and quick downstream circuitry of slide block and slide block downstream circuitry at a slow speed all cut off the power supply, and have only slide block backhaul circuit to still have power supply, therefore, in this case, but that slide block backhaul action but can not continue is descending, can avoid the counter-jib unbalance loading to fracture.

Claims

1. bender unbalanced load protection device, comprise the quick downstream circuitry of slide block, slide block downstream circuitry, slide block backhaul circuit and control circuit at a slow speed, slide block backhaul circuit and control circuit are connected between the both ends of power respectively, control circuit is used to control that slide block is descending fast, descending, backhaul and oil cylinder pressurize at a slow speed, pressure release, it is characterized in that an optoelectronic switch and a relay are connected in series in both ends of power, two normally-closed contacts of described relay are connected across both ends of power after the downstream circuitry series connection at a slow speed with the quick downstream circuitry of slide block, slide block respectively; Receiver that the control optoelectronic switch turns on and off and transmitter are corresponding respectively to be arranged on the two oil cylinder piston bars at slide block two ends.